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Published on: December 11, 2013
Concurrent Validity of Postural Sway Measures in Older Adults with Cognitive Impairment
Ellen L McGough1, Lin-Ya Hsu1, Hilaire Thompson2
1Department of Rehabilitation Medicine, University of Washington.
Aims:
To examine concurrent validity of inertial sensor (APDM ISway) versus force plate center of pressure (COP) measures of postural sway in cognitively impaired older adults.
Methods:
Participants, mean age 85.6 (SD 4.8), were tested in 4 static standing conditions: (1) eyes open/normal base, (2) eyes open/narrow base, (3) eyes closed/normal base, and (4) eyes closed/narrow base. ISway and COP measures were collected.
Results:
Strong correlations between ISway trunk sway smoothness [ISway JERK, (m /s )] and COP path length (r = 0.67-0.85) and COP mean velocity (r = 0.77-0.87); also ISway total sway acceleration path length/trail duration [ISway PATH, (m2/s2)] and COP path length (r = 0.77-0.87) and COP mean velocity (r = 0.77-0.91). Increased sway was detected in narrow versus normal base and eyes closed versus open conditions (P = .001).
Conclusions:
APDM ISway demonstrated concurrent validity to force-plate COP and changes in postural sway were detected between conditions.
